Missing addends to 15

Front

9 + ___ = 13

Back

4

Front

6 + ___ = 8

Back

2

Front

9 + ___ = 15

Back

6

Front

5 + ___ = 8

Back

3

Front

6 + ___ = 10

Back

4

Front

7 + ___ = 15

Back

8

Front

4 + ___ = 10

Back

6

Front

3 + ___ = 5

Back

2

Front

8 + ___ = 15

Back

7

Front

2 + ___ = 5

Back

3